From owner-freebsd-hackers@FreeBSD.ORG Wed Jul 14 13:06:43 2004 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A8B6916A4CE for ; Wed, 14 Jul 2004 13:06:43 +0000 (GMT) Received: from durandal.jeannot.org (durandal.jeannot.org [80.65.225.54]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9E19743D1D for ; Wed, 14 Jul 2004 13:06:40 +0000 (GMT) (envelope-from js@jeannot.org) Received: from [127.0.0.1] (localhost [127.0.0.1])i6ED6QYM001267; Wed, 14 Jul 2004 15:06:26 +0200 (CEST) (envelope-from js@jeannot.org) Message-ID: <40F52FD1.9040908@jeannot.org> Date: Wed, 14 Jul 2004 15:06:25 +0200 From: Jean-Sebastien Roy User-Agent: Mozilla Thunderbird 0.7.1 (X11/20040703) X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-hackers@freebsd.org References: <40EF172C.7020508@jeannot.org> <20040713233120.GA79064@comp.chem.msu.su> In-Reply-To: <20040713233120.GA79064@comp.chem.msu.su> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Mailman-Approved-At: Thu, 15 Jul 2004 11:46:21 +0000 cc: Yar Tikhiy cc: marck@rinet.ru Subject: Re: Silent errors when reading CDs X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Jul 2004 13:06:43 -0000 Dmitry Morozovsky wrote: >What if you copy that big file from CD to HD twice (possibly with >unmounting/remounting in the middle) and check MD5s there? > > I tried a few times and got no error. >Testing your memory with memtest86.com's test would also be helpful to >eliminate RAM issues. > > Could get memtest86 to run for some reasons, but I tried memtest multiple times and got no error. Yar Tikhiy wrote: >Once I had an old noname PC (iP200 in an i430VX motherboard), and >I installed a DVD+RW drive into it. Data read from a CD or DVD was >damaged with high probability. With hw.ata.atapi_dma set to zero, >the probability of data corruption was lower, but still noticable. >That's while there were no corruption on burning in DMA or PIO mode. > > At least I'm not alone ! >Are there CDs in your collection that produce no errors? > > Yes, but I cannot really tell if it's by chance or they really do not produce errors. >Even a badly scratched CD won't produce damaged data unless read >in a brain-dead drive. If your drives work OK with a different ATA >controller, then it's probably your present ATA controller to blame. > > The CDs read well in other computers. FWIW, my ATA controler is an Intel ICH5 : atapci0: port 0x24c0-0x24cf,0x280c-0x280f,0x24f0-0x24f7,0x2808-0x280b,0x24e8-0x24ef irq 10 at device 31.1 on pci0 ata0: at 0x1f0 irq 14 on atapci0 ata1: at 0x170 irq 15 on atapci0 atapci1: port 0x24d0-0x24df,0x2814-0x2817,0x2800-0x2807,0x2810-0x2813,0x24f8-0x24ff irq 10 at device 31.2 on pci0 ata2: at 0x24f8 on atapci1 ata3: at 0x2800 on atapci1 ad0: 38166MB [77545/16/63] at ata0-master UDMA100 acd0: DVD-R at ata1-master UDMA33 I think I will live with this bug until I change hardware. Many thanks ! js